A motorcycle engine

Abstract

The present invention provides a motorcycle engine, belonging to the field of engine technology. It solves the problems of poor water circuit reliability and poor cooling effect on engine oil in existing motorcycle engines. The motorcycle engine includes a casing and a cylinder body. An oil cooler and an oil filter are mounted on the front side wall of the casing. A thermostat is mounted on the front side wall of the cylinder body. The oil cooler is located below the thermostat, and the oil filter is located on one side of the oil cooler. A water inlet channel and a water outlet channel are provided in the casing. The upper ends of the water inlet channel and the water outlet channel are both connected to the thermostat, the lower end of the water inlet channel is connected to the water inlet of the oil cooler, and the lower end of the water outlet channel is connected to the water outlet of the oil cooler. The casing also includes an oil inlet channel, one end of which is connected to the oil filter, and the other end is connected to the oil inlet of the oil cooler. The water circuit of the motorcycle engine has high reliability and good cooling effect on engine oil.

Description

Technical Field

[0001] The invention belongs to the technical field of engines and relates to a motorcycle engine. Background Art

[0002] A motorcycle engine ignites the fuel mixture entering the cylinder, converting the resulting heat into mechanical energy. The crankshaft then transmits this energy through a transmission mechanism to the motorcycle's rear wheel, effectively turning it into propulsion. The eight main components of a motorcycle engine, arranged from top to bottom, are the cylinder head, cylinder block, and engine case. The cylinder head houses components like spark plugs and valves, the cylinder block houses the combustion chamber, and the case houses the crankshaft. The piston in the combustion chamber drives the crankshaft below via a connecting rod, which then connects the crankshaft's outer end to the rear wheel via a transmission mechanism, generating power output. Because the engine's temperature is low upon startup, affecting performance, it needs to be heated up. During normal operation, a significant amount of heat is generated, requiring cooling. This requires a circulating water circuit. An upper water jacket is located within the cylinder head, a chamber used to cool the cylinder head, spark plugs, and other components. A lower water jacket surrounds the combustion chamber and cools the cylinder block. The engine has two circulating water circuits: a small circuit and a large circuit. The thermostat switches these two circuits via an internal valve. The small circuit runs from water pump to upper water jacket, thermostat, lower water jacket, and water pump. This entire cycle is unheated, allowing heat to be circulated and transported, ensuring rapid and even engine temperature rise upon startup. The large circuit runs from water pump to upper water jacket, thermostat, radiator, thermostat, lower water jacket, and water pump. Cooling water is dissipated through the radiator and used to cool the engine.

[0003] The engine also has engine oil for lubrication, that is, the oil pump draws the oil in the oil pan into the oil channel. The oil in the oil channel is filtered by the oil filter and then lubricated to the crankshaft, camshaft and other components. However, the oil temperature will rise during operation, so an oil cooler will be installed on the engine. The oil cooler is an existing heat exchange device with water and oil circuits inside. Therefore, it has an oil inlet, an oil outlet, a water inlet and a water outlet. The water inlet and the water outlet are respectively connected to the circulating water circuit, and the oil inlet and the oil outlet are respectively connected to the oil channel, and the engine oil is cooled by cooling water.

[0004] As disclosed in the patent application (application number: 202211647623.9), the water circulation structure of a motorcycle engine includes a cylinder block and a cylinder head. The water circulation structure includes a water pump, a thermostat, and a water circuit. The water circuit includes a cylinder water jacket located in the cylinder block and a cylinder head water jacket located in the cylinder head. The inlet and outlet of the water pump are respectively connected to the cylinder water jacket and the cylinder head water jacket. The water circulation structure also includes a thermostat located on one side of the engine. The thermostat has an inlet chamber and an outlet chamber. The inlet chamber and the outlet chamber are connected through a liquid port. The cylinder water jacket is connected to the inlet chamber, and the cylinder head water jacket is connected to the outlet chamber. The inner wall of the inlet chamber has an inlet, and the inner wall of the outlet chamber has an outlet. At the same time, the engine also includes an oil cooler. The inner wall of the inlet chamber has a port 1, and the inner wall of the outlet chamber has a port 2. Port 1 and port 2 are respectively connected to the outlet and inlet of the oil cooler through external water pipes to cool the engine oil. The engine's oil filter is mounted on the side of the engine, while the thermostat and oil cooler are mounted on the front wall. These components are relatively dispersed. In particular, the outlet chamber supplying water to the oil cooler is connected to the cylinder head water jacket. This means the water pump pumps cooling water into the cylinder head water jacket to cool the cylinder head. The cooling water in the cylinder head water jacket then enters the outlet chamber and then the oil cooler to cool the engine oil. However, the cooling water after cooling the cylinder head is at a high temperature, so directly entering the oil cooler to cool the oil is ineffective. Furthermore, the thermostat supplies water to the oil cooler via an external water pipe, which is susceptible to external interference over long-term use and can suffer from defects such as aging, cracking, and leaks at the docking station. This results in poor reliability of the engine's water system. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose a motorcycle engine to solve the problems of poor reliability of the water circuit of the existing motorcycle engine and poor cooling effect on the engine oil.

[0006] The objectives of the present invention can be achieved through the following technical solutions: A motorcycle engine, comprising a box body and a cylinder body fixed above the box body, an oil cooler is installed on the front side wall of the box body, and a thermostat is installed on the front side wall of the cylinder body, characterized in that an oil filter is also installed on the front side wall of the box body, the oil cooler is located below the thermostat, and the oil filter is located on one side of the oil cooler horizontally, a water inlet channel and a water outlet channel are provided in the box body, the upper ends of the water inlet channel and the water outlet channel are both connected to the thermostat, the lower end of the water inlet channel is connected to the water inlet of the oil cooler, and the lower end of the water outlet channel is connected to the water outlet of the oil cooler, and an oil inlet channel is also provided in the box body, one end of the oil inlet channel is connected to the oil filter, and the other end is connected to the oil inlet of the oil cooler.

[0007] From bottom to top, the engine consists of an oil pan, a casing, a cylinder block and a cylinder head. A crankshaft is installed in the casing, and a combustion chamber is provided in the cylinder block. The piston in the combustion chamber drives the crankshaft below to rotate through a connecting rod to achieve power output. There are two circulating water circuits in the engine, namely a small circuit and a large circuit. The thermostat is used to switch between the two circulating water circuits. The small circuit is used to quickly heat up the engine when it starts, and the large circuit is used to cool the engine. The oil cooler is an existing heat exchange device with water and oil circuits inside. Therefore, it has an oil inlet, an oil outlet, a water inlet and a water outlet. The engine oil is cooled by cooling water, and the oil filter is used to filter impurities in the engine oil. In this application, the thermostat, oil cooler and oil filter are all installed on the front side of the engine, so that the airflow can act positively and cool the engine during driving, which also makes the structure more compact. The cooling water in the water cycle needs to enter the oil cooler to cool the engine oil and then return to the water cycle. However, the present application directly opens the water inlet and outlet channels in the box body, without the need for additional water pipes, thus avoiding the pulling, cracking, breaking, aging, etc. of the water pipes due to interference during use, thereby improving the reliability of use. At the same time, the front side of the box body is cooled by the air flow, and the water inlet and outlet channels opened on the box body can also directly exchange heat with the box body, cooling the cooling water and improving the cooling effect. Furthermore, the oil filter is set on the lateral side of the oil cooler, so that the two are closer, and the oil inlet channel can be directly opened on the box body without the need for oil pipes, thus simplifying the structure and improving the reliability of use. Similarly, the oil in the oil inlet channel can also directly exchange heat with the box body, thereby improving the cooling effect of the oil.

[0008] In the aforementioned motorcycle engine, the front sidewall of the housing includes a forward-projecting oil cooler mounting seat and an oil filter mounting seat. The oil cooler is fixedly mounted on the front face of the oil cooler mounting seat, while the oil filter is fixedly mounted on the front face of the oil filter mounting seat. The oil cooler mounting seat and the oil filter mounting seat are arranged in a transversely aligned and adjacent arrangement. Both the oil cooler mounting seat and the oil filter mounting seat protrude forward, enabling heat exchange with airflow from the front, thereby cooling the cooling water passing through the oil cooler mounting seat and the engine oil passing through the oil filter mounting seat, thereby improving cooling efficiency. The transverse proximity of the oil cooler mounting seat and the oil filter mounting seat results in a compact structure and a more simplified and reliable oil inlet channel structure.

[0009] The aforementioned motorcycle engine is characterized in that an air passage is formed between the oil cooler mounting seat and the oil filter mounting seat, the front sidewall of the housing includes a forwardly projecting heat dissipation projection, the heat dissipation projection laterally extending through the air passage, and the oil inlet passage is laterally disposed within the heat dissipation projection. The heat dissipation projection is located on the front sidewall of the housing and projects forward, and the air passage serves to focus and guide airflow, allowing airflow to strike the heat dissipation projection, dissipating heat and reducing temperature, thereby cooling the oil within the internal oil inlet passage and improving the cooling effect on the oil.

[0010] In the aforementioned motorcycle engine, the air duct is arranged vertically, with its central portion curving in an arc toward the oil cooler mounting base. Since the cylinder block typically tilts forward, the vertical arrangement of the air duct allows for smoother airflow from top to bottom. The central portion of the air duct curves toward the oil cooler mounting base, allowing air entering the air duct to impact the side of the mounting base, improving the cooling effect on the oil cooler mounted thereon, as well as the cooling water and oil passing through it.

[0011] In the aforementioned motorcycle engine, the front sidewall of the housing has two elongated, forward-projecting heat dissipation ribs. The lower ends of the two heat dissipation ribs extend to the upper side of the oil cooler mounting base. The water inlet and outlet channels are respectively defined within the two heat dissipation ribs along their lengths. The protruding heat dissipation ribs are provided on the housing sidewalls and are integrally formed with the housing, their material being the same as that of the housing, both being a metal material with good thermal conductivity. The heat dissipation ribs are located on the front sidewalls and face forward. The water inlet channel is defined within the heat dissipation ribs. When the motorcycle is in motion, airflow directly impacts the heat dissipation ribs, dissipating heat from the ribs and lowering the temperature of the cooling water within the water inlet channel. This allows the cooling water to enter the oil cooler at a lower temperature to cool the engine oil, thereby improving the cooling effect on the engine oil. At the same time, the water outlet channel is also opened in another heat dissipation rib, that is, the cooling water after heat exchange with the engine oil in the oil cooler can also be cooled down when passing through the water outlet channel, so that the cooling water enters the thermostat at a lower temperature, thereby improving the cooling effect of the entire large circulation water circuit.

[0012] In the aforementioned motorcycle engine, a long, strip-shaped guide groove is formed between the two heat dissipation ribs. The upper end of the guide groove is inclined forward, and the lower end extends to the upper side of the oil cooler mounting base. Airflow is concentrated within the guide groove, avoiding direct diffusion from the left and right sides. Airflow flows downward along the guide groove, improving the cooling effect on the heat dissipation ribs on both sides. At the same time, the airflow within the guide groove directly impacts the oil cooler mounting base below, improving the heat dissipation effect on the oil cooler mounting base. This also allows the oil cooler mounted on the oil cooler mounting base to dissipate heat and cool down, improving the cooling effect on the engine oil.

[0013] In the above-mentioned motorcycle engine, the engine also includes a cylinder head fixed above the cylinder body, the cylinder head has an upper water jacket, the cylinder body has a lower water jacket, the thermostat includes a shell covered on the front side wall of the cylinder body, and a water inlet chamber and a return water chamber are formed between the shell and the cylinder body, and a water outlet chamber is also provided in the shell, the return water chamber has a return water interface for connecting to the water outlet end of the radiator, the water outlet chamber has a water outlet interface for connecting to the water inlet end of the radiator, the return water chamber is connected to the lower water jacket, the water inlet chamber is respectively connected to the upper water jacket and the water outlet chamber, the return water chamber and the water outlet chamber are connected through a water outlet, and the water outlet chamber is further provided with a valve core capable of controlling the opening and closing of the water outlet and the water outlet interface, the upper end of the water inlet channel is connected to the water inlet chamber, and the upper end of the water outlet channel is connected to the return water chamber. The output end of the water pump is connected to the upper water jacket of the cylinder head, and the input end is connected to the lower water jacket of the cylinder body. The input end of the radiator is connected to the water outlet interface of the water outlet chamber, and the output end is connected to the return water interface of the return water chamber. The structure of the valve core controlling the opening and closing of the water inlet and the water outlet interface belongs to the existing structure of the thermostat. When the temperature is low, the water inlet hole is opened and the water outlet structure is closed under the action of the elastic member. When the temperature rises, the valve core can move to close the water inlet hole and open the water outlet interface. Therefore, when the valve core opens the water inlet and closes the water outlet interface, a small circulation water circuit is formed: water pump-upper water jacket-water inlet chamber-water outlet chamber-return water chamber-lower water jacket-water pump ; When the valve core closes the water inlet and opens the water outlet interface, a large circulation water circuit is formed: water pump-upper water jacket-water inlet chamber-water outlet chamber-radiator-return water chamber-lower water jacket-water pump; part of the cooling water in the water inlet chamber enters the oil cooler through the water inlet channel to cool the engine oil, and then returns to the return water chamber through the water outlet channel. Therefore, the cooling water that passes through the oil cooler and returns to the return water chamber will not pass through the radiator for heat dissipation and cooling, but can cool the cooling water coming out of the oil cooler through the water outlet channel in the heat dissipation rib, thereby reducing the temperature of the cooling water in the return water chamber, avoiding affecting the cooling of the cylinder body due to the cooling of the engine oil.

[0014] In the aforementioned motorcycle engine, the water inlet chamber is located above the return water chamber. The return water chamber includes a heat exchange portion extending upward from a bottom surface to a top surface. The heat exchange portion is cylindrical in shape, and a heat exchange channel is defined within the heat exchange portion along its length. The upper end of the heat exchange channel communicates with the water inlet chamber, and the lower end communicates with the upper end of the water inlet channel. Because the cooling water in the water inlet chamber flows from the upper water jacket and has already undergone heat exchange with the cylinder head, its temperature is relatively high, while the cooling water in the return water chamber enters from the radiator and has already been cooled, its temperature is relatively low. Therefore, the thermostat positions the water inlet chamber above the return water chamber, requiring the heat exchange channel to pass through the return water chamber. Therefore, a cylindrical heat exchange portion is provided within the return water chamber, and the heat exchange channel is defined within the heat exchange portion. The cooling water in the water inlet chamber is cooled by the cooling water in the water inlet chamber as it flows through the heat exchange channel to the oil cooler. The cooling water then enters the water inlet channel through the heat exchange channel, being cooled by the airflow, thereby combining water cooling with air cooling to improve the cooling effect on the engine oil.

[0015] In the aforementioned motorcycle engine, the cylinder sidewall has two through-holes connecting the lower water jacket and the return water chamber. The heat exchange portion is located approximately in the middle of the return water chamber's width and protrudes forward, with the two through-holes located on either side of the heat exchange portion. The cylinder contains a combustion chamber, and the lower water jacket forms a cooling chamber surrounding the combustion chamber. The lower water jacket is directly connected to the return water chamber via the through-holes. The return water chamber is connected to the lower water jacket via the two through-holes, positioning the heat exchange portion in the middle of the return water chamber. The two through-holes are located on either side of the heat exchange portion. The heat exchange portion functions to divert cooling water, allowing the cooling water to fully impact and act on the heat exchange portion, thereby cooling the heat exchange portion, i.e., cooling the cooling water within the heat exchange channel, thereby improving the cooling effect on the engine oil.

[0016] In the aforementioned motorcycle engine, the cylinder block further defines a buffer chamber and a water return channel. The lower end of the heat exchange channel and the upper end of the water inlet channel are both connected to the buffer chamber. The lower end of the water return channel is connected to the upper end of the water outlet channel, and the upper end is connected to the water return chamber. Cooling water flowing from the heat exchange channel to the water inlet channel is first buffered in the buffer chamber, thereby reducing the flow rate upon entering the water inlet channel, extending the cooling time, and improving the cooling effect.

[0017] Compared with the prior art, this motorcycle engine has the following advantages:

[0018] 1. Since the water inlet and outlet channels are directly opened in the box, there is no need to set up additional water pipes, which avoids the water pipes from being pulled, cracked, broken, aged, etc. due to interference during use, thereby improving reliability.

[0019] 2. Since the thermostat, oil cooler and oil filter are all installed on the front side of the engine, the airflow can act positively and cool down the engine while the vehicle is driving. At the same time, the front side of the box is cooled by the airflow, and the water inlet and outlet channels opened on the box can also directly exchange heat with the box, cooling the cooling water and improving the cooling effect on the engine oil.

[0020] 3. Since the oil filter is set on the lateral side of the oil cooler, the two are closer, and the oil inlet channel can be opened directly on the box body without the need for oil pipes, which simplifies the structure and improves reliability. Similarly, the oil in the oil inlet channel can also directly exchange heat with the box body, improving the cooling effect of the oil.

[0021] 4. Since protruding heat dissipation ribs are provided on the front side wall of the box body, and the water inlet channel is opened in the heat dissipation ribs, the airflow acts on the heat dissipation ribs positively when the motorcycle is running, dissipating the heat from the heat dissipation ribs and reducing the temperature of the cooling water in the water inlet channel. As a result, the cooling water after cooling the cylinder head can be cooled down first, and then enter the oil cooler to cool down the engine oil, thereby improving the cooling effect of the engine oil.

[0022] 5. Since there is a heat exchange part in the return water chamber and the heat exchange channel is opened in the heat exchange part, the cooling water in the water inlet chamber can be cooled by the cooling water in the return water chamber when it flows to the oil cooler through the heat exchange channel, and then enters the water inlet channel from the heat exchange channel to be cooled by the air flow, thereby combining water cooling and air cooling to improve the cooling effect of the engine oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of a motorcycle engine.

[0024] Figure 2 This is a three-dimensional structural diagram of a motorcycle engine from another perspective.

[0025] Figure 3 This is a front view of the structure of a motorcycle engine.

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the cylinder.

[0027] Figure 5 yes Figure 1 A magnified view of the structure at point A in the middle.

[0028] Figure 6 yes Figure 3 Cross-sectional view of the local structure at BB in the middle.

[0029] Figure 7 yes Figure 3 Structural cross-section view at CC in the middle.

[0030] Figure 8 yes Figure 3 Structural cross-section view at DD in the middle.

[0031] Figure 9 yes Figure 3 Structural cross-section view at EE.

[0032] Figure 10 yes Figure 3 Structural cross-sectional view at FF in the middle.

[0033] Figure 11 yes Figure 3 Cross-sectional view of the local structure at GG in the middle.

[0034] Figure 12 yes Figure 3 Cross-sectional view of the local structure at HH in the middle.

[0035] Figure 13 yes Figure 12 A magnified view of the structure at point I in the middle.

[0036] In the figure, 1. casing; 11. heat dissipation rib; 12. water inlet channel; 13. water outlet channel; 14. guide groove; 15. oil cooling mounting seat; 16. oil filter mounting seat; 17. air passage; 18. heat dissipation rib; 19. oil inlet channel; 2. cylinder block; 21. lower water jacket; 22. heat exchange part; 23. heat exchange channel; 24. buffer chamber; 25. return water channel; 26. through-hole; 3. cylinder head; 31. upper water jacket; 4. thermostat; 41. casing; 42. water inlet chamber; 43. return water chamber; 431. return water interface; 44. water outlet chamber; 441. water outlet interface; 45. water outlet; 46. valve core; 47. throttling part; 48. throttling channel; 5. oil cooler; 6. oil filter; 7. water pump; 71. water pipe. DETAILED DESCRIPTION

[0037] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0038] like Figure 1 、 Figure 2 As shown, a motorcycle engine includes a housing 1, a cylinder block 2 and a cylinder head 3. The cylinder block 2 is fixed on the top surface of the housing 1, and the cylinder head 3 is fixed on the top surface of the cylinder block 2, and the cylinder head 3 is tilted forward. A thermostat 4 is installed on the front side wall of the cylinder block 2, and an oil cooler 5 and an oil filter 6 are installed on the front side wall of the housing 1. The oil cooler 5 is located below the thermostat 4, and the oil filter 6 is located on one side of the oil cooler 5. A water pump 7 is installed on the side of the housing 1, and the output and input ends of the water pump 7 are both connected to water pipes 71. Combined Figure 3 、 Figure 4As shown, the cylinder head 3 has an upper water jacket 31 for cooling the cylinder head 3, spark plugs, etc. The cylinder body 2 has a lower water jacket 21, which surrounds the combustion chamber and is used to cool the cylinder body 2. A water pipe 71 at the output end of the water pump 7 is connected to the upper water jacket 31 in the cylinder head 3, and a water pipe 71 at the input end of the water pump 7 is connected to the lower water jacket 21 in the cylinder body 2. The thermostat 4 includes a housing 41, which is fixedly mounted on the front side wall of the cylinder body 2, and a water inlet chamber 42 and a water return chamber 43 are formed between the housing 41 and the front side wall of the cylinder body 2. A water outlet chamber 44 is also provided in the housing 41, wherein the water inlet chamber 42 is respectively connected to the upper water jacket 31 of the cylinder head 3 and the water outlet chamber 44, and one lateral end of the water outlet chamber 44 is connected to the water return chamber 43 through a water port 45. The other lateral end of the water outlet chamber 44 has a water outlet interface 441, which is used to connect to the water inlet end of the radiator, and the water return chamber 43 has a water return interface 431, which is used to connect to the water outlet end of the radiator. The return water chamber 43 is also connected to the lower water jacket 21 of the cylinder body 2. A valve core 46 capable of controlling the opening and closing of the water port 45 and the water outlet interface 441 is provided in the water outlet chamber 44 of the shell 41. The control structure of the valve core 46 is the existing technology, including an elastic member and a thermostat. When the engine is just started and the overall temperature is low, the elastic member acts on one end of the valve core 46 to close the water outlet interface 441 of the water outlet chamber 44, and the other end to open the water port 45. At this time, the circulating water circuit is a small circulating water circuit: water pump 7-upper water jacket 31-water inlet chamber 42-water outlet chamber 44-return water chamber 43-lower water jacket 21-water pump 7, which is used to quickly heat up the engine when it starts. When the engine temperature reaches the set value, the valve core 46 moves to open the water outlet interface 441 and close the water outlet 45. At this time, the circulating water circuit is a large circulating water circuit: water pump 7-upper water jacket 31-water inlet chamber 42-water outlet chamber 44-radiator-return water chamber 43-lower water jacket 21-water pump 7, which is used to cool the engine.

[0039] Specifically, combined Figure 5 、 Figure 6 As shown, the oil cooler 5 is an existing heat exchange device with water and oil circuits inside, and thus has an oil inlet, an oil outlet, a water inlet and a water outlet, and cools the engine oil through cooling water. Figure 9 、 Figure 10 、 Figure 11As shown, the front sidewall of the casing 1 has a forward-projecting oil cooler mounting seat 15 and an oil filter mounting seat 16. The oil cooler 5 is fixedly mounted on the front end surface of the oil cooler mounting seat 15, and the oil filter 6 is fixedly mounted on the front end surface of the oil filter mounting seat 16. Two heat dissipation ribs 11 are integrally formed on the front sidewall of the casing 1. These two heat dissipation ribs 11 are elongated and protrude forward. One heat dissipation rib 11 has a water inlet channel 12 defined along its length, and the other heat dissipation rib 11 has a water outlet channel 13 defined along its length. A heat exchange channel 23, a buffer chamber 24, and a water return channel 25 are vertically defined within the cylinder body 2. The cross-section of the buffer chamber 24 is larger than the cross-sectional areas of the heat exchange channel 23 and the water inlet channel 12. The upper end of the heat exchange channel 23 is connected to the water inlet chamber 42, and the lower end of the heat exchange channel 23 extends downward to the top surface of the buffer chamber 24 and is connected to the buffer chamber 24. The upper end of the water inlet channel 12 extends to the bottom surface of the buffer chamber 24 and is connected to the buffer chamber 24. The lower end of the water inlet channel 12 extends to the oil cooling mounting seat 15 and is connected to the water inlet of the oil cooler 5. The lower end of the water outlet channel 13 extends to the oil cooling mounting seat 15 and is connected to the water outlet of the oil cooler 5. The upper end of the water outlet channel 13 is connected to the lower end of the water return channel 25, and the upper end of the water return channel 25 extends to the bottom surface of the water return chamber 43 and is connected to the water return chamber 43.

[0040] The upper end of the front side wall of the box body 1 is tilted forward, so that the upper ends of the two heat dissipation ribs 11 are tilted forward, the oil cooling mounting seat 15 is located below the two heat dissipation ribs 11, and the lower ends of the two heat dissipation ribs 11 extend downward to the upper side of the oil cooling mounting seat 15. A long strip of guide groove 14 is formed between the two heat dissipation ribs 11, the upper end of the guide groove 14 is tilted forward, and the lower end extends to the upper side of the oil cooling mounting seat 15. The oil cooler 5 is in the shape of a rectangular block, and the oil cooler 5 is located below the two heat dissipation ribs 11. The angle between the upper side of the oil cooler 5 and the heat dissipation ribs 11 is an acute angle. Combined with Figure 7 、 Figure 8 As shown, the oil cooling mounting seat 15 and the oil filter mounting seat 16 are arranged horizontally and close to each other, and an air passage 17 is formed between the oil cooling mounting seat 15 and the oil filter mounting seat 16. The air passage 17 is arranged vertically, and the middle part of the air passage 17 is curved toward the side where the oil cooling mounting seat 15 is located. A heat dissipation protrusion 18 protruding forward is provided on the front side wall of the box body 1. The heat dissipation protrusion 18 passes through the air passage 17 horizontally, and an oil inlet passage 19 is opened horizontally in the heat dissipation protrusion 18. One end of the oil inlet passage 19 is connected to the oil filter 6, and the other end passes through the oil cooling mounting seat 15 and is connected to the oil inlet of the oil cooler 5. The airflow passing through the air passage 17 can cool the heat dissipation protrusion 18, thereby cooling the oil in the oil inlet passage 19.

[0041] Combine Figure 12 、 Figure 13As shown, the water inlet chamber 42 is located above the return water chamber 43, and the return water chamber 43 has a heat exchange portion 22 extending from the bottom surface to the top surface. The heat exchange portion 22 is columnar, and the upper end of the heat exchange channel 23 is opened in the heat exchange portion 22 along the length direction, and the upper end of the heat exchange channel 23 penetrates upward to the bottom surface of the water inlet chamber 42. There are two through-holes 26 on the side wall of the cylinder body 2 that connect the lower water jacket 21 and the return water chamber 43. The heat exchange portion 22 is roughly located in the middle of the return water chamber 43 in the horizontal direction and protrudes forward. The two through-holes 26 are respectively located on both sides of the heat exchange portion 22, and the inner end of the return water interface 431 of the return water chamber 43 is tilted backward and toward the heat exchange portion 22. The bottom surface of the return water chamber 43 also has a throttling portion 47 protruding toward the heat exchange portion 22, and the throttling portion 47 extends forward to the front side wall of the return water chamber 43. The throttling portion 47 is located in the front side of the heat exchange portion 22, and a throttling channel 48 is formed between the throttling portion 47 and the heat exchange portion 22. One of the through-ports 26 and the return water interface 431 are respectively located at the two ends of the throttling channel 48. The cooling water in the return water chamber 43 needs to pass through the throttling channel 48 when entering the through-port 26 on the side. The throttling channel 48 can make the passing water flow closer to the heat exchange portion 22 and the flow rate become faster, thereby improving the cooling effect on the heat exchange portion 22.

[0042] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0043] Although this document frequently uses terms such as housing 1, balancing chamber 11, and mounting hole 12, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A motorcycle engine, comprising a housing (1) and a cylinder (2) fixed above the housing (1), an oil cooler (5) being mounted on the front side wall of the housing (1), and a thermostat (4) being mounted on the front side wall of the cylinder (2), characterized in that: An oil filter (6) is also installed on the front side wall of the box (1), the oil cooler (5) is located below the thermostat (4), and the oil filter (6) is located on one side of the oil cooler (5). A water inlet channel (12) and a water outlet channel (13) are provided in the box (1), the upper ends of the water inlet channel (12) and the water outlet channel (13) are both connected to the thermostat (4), the lower end of the water inlet channel (12) is connected to the water inlet of the oil cooler (5), and the lower end of the water outlet channel (13) is connected to the water outlet of the oil cooler (5). An oil inlet channel (19) is also provided in the box (1), one end of the oil inlet channel (19) is connected to the oil filter. (6), and the other end is connected to the oil inlet of the oil cooler (5); the thermostat (4) includes a shell (41) covered on the front side wall of the cylinder body (2), and a water inlet chamber (42) and a water return chamber (43) are formed between the shell (41) and the cylinder body (2), the water inlet chamber (42) is located above the water return chamber (43), and the water return chamber (43) has a heat exchange portion (22) extending upward from the bottom surface to the top surface, the heat exchange portion (22) is columnar, and a heat exchange channel (23) is opened in the heat exchange portion (22) along the length direction, the upper end of the heat exchange channel (23) is connected to the water inlet chamber (42), and the lower end is connected to the upper end of the water inlet channel (12).

2. The motorcycle engine according to claim 1, characterized in that: The front side wall of the box body (1) is provided with an oil cooling mounting seat (15) and an oil filter mounting seat (16) protruding forward, the oil cooler (5) is fixedly mounted on the front end surface of the oil cooling mounting seat (15), and the oil filter (6) is fixedly mounted on the front end surface of the oil filter mounting seat (16), and the oil cooling mounting seat (15) and the oil filter mounting seat (16) are arranged in a transverse direction and are close to each other.

3. The motorcycle engine according to claim 2, characterized in that: An air passage (17) is formed between the oil cooling mounting seat (15) and the oil filter mounting seat (16), and a heat dissipation protrusion (18) protruding forward is provided on the front side wall of the housing (1). The heat dissipation protrusion (18) passes through the air passage (17) in the transverse direction, and the oil inlet passage (19) is opened in the heat dissipation protrusion (18) in the transverse direction.

4. The motorcycle engine according to claim 3, characterized in that: The air passage (17) is arranged vertically, and the middle portion of the air passage (17) is curved in an arc shape toward the side where the oil cooling mounting seat (15) is located.

5. The motorcycle engine according to claim 2, 3 or 4, characterized in that: The front side wall of the box body (1) has two long strip-shaped heat dissipation ribs (11) protruding forward, the lower ends of the two heat dissipation ribs (11) extending to the upper side of the oil cooling mounting seat (15), and the water inlet channel (12) and the water outlet channel (13) are respectively opened in the two heat dissipation ribs (11) along the length direction.

6. The motorcycle engine according to claim 5, characterized in that: A long strip-shaped guide groove (14) is formed between the two heat dissipation ribs (11), the upper end of the guide groove (14) is inclined forward, and the lower end extends to the upper side surface of the oil cooling mounting seat (15).

7. The motorcycle engine according to claim 2, 3 or 4, characterized in that: The engine further comprises a cylinder head (3) fixed above the cylinder body (2), the cylinder head (3) having an upper water jacket (31), the cylinder body (2) having a lower water jacket (21), a water outlet chamber (44) further provided in the housing (41), the return water chamber (43) having a return water interface (431) for connecting to a water outlet end of a radiator, the water outlet chamber (44) having a water outlet interface (441) for connecting to a water inlet end of a radiator, the return water chamber (43) and the lower water jacket (21) The water inlet chamber (42) is connected to the upper water jacket (31) and the water outlet chamber (44), respectively. The return water chamber (43) and the water outlet chamber (44) are connected via a water port (45). A valve core (46) capable of controlling the opening and closing of the water port (45) and the water outlet interface (441) is further provided in the water outlet chamber (44). The upper end of the water inlet channel (12) is connected to the water inlet chamber (42), and the upper end of the water outlet channel (13) is connected to the return water chamber (43).

8. The motorcycle engine according to claim 7, characterized in that: The side wall of the cylinder body (2) has two through-holes (26) communicating with the lower water jacket (21) and the return water chamber (43). The heat exchange portion (22) is approximately located in the middle of the return water chamber (43) in the width direction and protrudes forward. The two through-holes (26) are respectively located on both sides of the heat exchange portion (22).

9. The motorcycle engine according to claim 7, characterized in that: The cylinder body (2) is further provided with a buffer chamber (24) and a return water channel (25); the lower end of the heat exchange channel (23) and the upper end of the water inlet channel (12) are both connected to the buffer chamber (24); the lower end of the return water channel (25) is connected to the upper end of the water outlet channel (13), and the upper end is connected to the return water chamber (43).

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